Lens-grinding machine.



W. J. SLAVIN.

LENS GRINDING MACHINE.

APPLICATION FILED JAN. 15, 1910.

Patented Dec.27,1910.

INILNTOR.

(52 .4 TTORNE y.

UNITED STATES PATENT OFFICE.

-WILLIAM J. SLAVIN, OF HORSEHEADS, NEW YORK, ASSIGNOR T WINCHESTEROPTICAL COMPANY, OF HORSEHEADS, NEW YORK, A CORPORATION OF NEW YORK.

LEN S-GRINDING MACHINE.

Specification of Letters Patent.

Application filed January 15, 1910. Serial No. 538,314.

To all it may concern:

Be it known that I, WILLIAM J. SLAVIN, a

citizen of the United States, residing at Horseheads, in the county ofChemung and State of New York, have invented certain new and usefulImprovements in Lens- Grinding Machines, of which the following is aspecification.

My invention relates to improvements in lens-grinding machines forgrinding intO shape the lenses used in spectacles or eyeglasses and forother similar urposes.

The invention consists in t e general construction of the. frame andparts which cooperate in holding the lens-pattern and the lenses as theyare rotated and formed in conjunction with the grinding stone.

The main objects of my invention are to provide a new and better meansto hold the lens-pattern, to facilitate its removal or readjustment, andmore perfect cooperation with the lens holding heads, to provide forlocating the lens-pattern to one side of the face of the stone close toand between bearings of the frame and where it is free from the washingsof the stone, then again in providing. a multiple of quickly operatedholder frame and its parts. Fig. 2 is a sec tional elevation of same butshowing in addltion the lower operating shaft on which the lens holderframe is mounted to oscillate toward and away from the grinding stone,and boxes of the main frame broken away supporting said shaft, withpinions thereon which impart rotation to the upper gears and shafts ofthe holder. Fig. 3 is an end elevationpartly of Fig. 1 in direction ofthe arrow C. Fig. 4 is a perspective view of the shaft cap serving tolock two of the shafts together while gripping the lens-pattern betweenthem. Fig. 5 is a perspective View of the lens-pattern. Fig. 6 is aperspective view of the central shaft which has at one end one of thelens holding heads, and

Patented Dec. 27, 1910.

at the other end a flattened part with shoulder for holding thelens-pattern. Fig. 7 is a View of same parts as Fig. 6 looking directlyat the flattened end of the shaft. Fig. 8 is a view in elevation of thegrinding stone and other parts of a lens grinding machine showing therelation of my improved lens and pattern holding device therewith onsection A AFig. 1.

With reference to the drawings 1 represents the bod portion of the frameof my improved hol er, its lower part formingthe boxes 2 and 3 whichsupport the holder frame on the shaft 4 which is journaled in raisedboxes 5 and 6 of the main frame 7 of the grinder. Between said raisedboxes and those of the holder frame are the pinions 8 and 9 made fast onthe shaft 41 and intermeshing with the gears 10 and 11 which serve torotate the shafts 12,13,14 and sleeve 15 journaled in the boxes 16, I7and 18,

which form the upper part of the holder frame. Fig. 8 illustrates ameans for rotat ing said shaft 4, such as may be imparted from the shaftof the grinding'tstone.

Shafts 12, 13, and 14, are arranged in the same axial line, the shafts12 .and 14 are made to slide endwise in their bearings, the center shaft14 being free to slide in direction of the lens gripping heads untilwithdrawn from coupling with the cap 1.) fixed on the shaft 13 andreleasing the lens pattern 20 so it may be freely removcd or replaced.

The knurled disk 21 provides means by which the shaft 12 may be quicklyreciprocated by hand to bring the lens holding head 22 to hear on a lensplaced between it and the head 23 of the central shaft 14, at which timeto make the grip on the lens more complete, or of such pressure as maybe desired, a check nut 24 threaded on the shaft 12 and knurled on itsperiphery may be screwed to lock with the face and shouldered end 25 ofthe sleeve 15. As thus locked it will be seen that the end ressure .ofthe shafts while gripping the ens firmly inrinding will also grip thelens-pattern, an that the end thrust of said shafts will not materiallyaffeet their rotation because of the ball-bearing rings 26 and 27suitably housed'wlth .made by the cap 19 on shaft 13.

balls-and counteracting rings 28 and 29, lo-

cated adjoining the frame boxes and baclg of the shoulder at the innerend of the sleeve which rotates with shaft 12, and shoulder cap 19, andto the end of the shaft 14 fitted to. nicely pass through said openingsin the pattern and cap up to a shoulder which engages the side of thepattern, the shaft 13 having a hole drilled in its capped endsufiiciently large to not interfere with the end 31 of the central shaft14 as it passes throu h the cap in being coupled therewith.

Re erring to Fig; 8 the lens-pattern is shown in contact with an arm 32made adjustable to slide in the way 33, by means of the hand'screw 34,held in the standard 35 bolted to the frame 7. By turning the screw withthe knurled disk 36 the arm 32 may be moved toward or' away from theaxis of the stone, vmoizin the lens so it may be ground on the peripiery of the stone to such diametrical measurement as .may be desired,

the connectin gearlng revolving the lens inopposite direction to that'ofthe stone. Oscillation is given the holder frame as the differentialdiameters of the pattern come in its rotation, being held thereto by thespring 37 connected to.

contact with the arm in the journal box of t e stone and pulling fromthetop of the holder frame.

' It will be seen that the shaft 12 is given revolution only at suchtimes as the check nut 24, threaded on said shaft, looks it togetherwith the sleeve carr ing it and 0 which the car 11 is made ast.

The sha ts 12 and 14 at their adjoining ends are turne "down to form areduced end and shoulder 38 and 39 on and against which the lensholdingheads 22 and 23 are mounted, said heads being covered onetheir abuttingfaces wit-h pads 40 made of rubber or other suitable material foraccommodating sec, 133

themselves to uneven surfaces, and to hold box, said central shafthaving a central and squarely formed tenon with shoulder for taking onthe lens pattern at one end and the lens gripping head at the other forcooperation with two outer shafts.

2. In a lens grinding machine, the combination with the grindin stone ofa lens holder having a central iox independent and intermedlary of twoouter boxes, an independent shaft in the central box, a lens patternwitha squared hole through its center to engage the vcentral shaft, an outershafttwith cap with a squared central-hole to also engage the centralshaft and the lens pattern, and another outer shaft reciprocable to andfrom the vided with a thread and nut for engage ment with a rotatablesleeve for carrying and rotating said shaft.

3. In a lens-grinding machine, in combination, a holder frame supportedby two lower boxes, and having one central box and twb end boxes in itsupper portion, a shaft independently journaled in each of the up perboxes, the central shaft having a lens gripping head on e side of itsbox and a o ;the other side, its

squared tenon en gripping head communicable with a head onr'one oftheouter shafts, and its tenon" end communicable with a squared hole,through the center of the lens former and the center of a cap coveringthe end of the other outer and rotatablydriven shaft.

In testimon whereof I lafiix my signature in presence 0 two witnesses.

' WVI'LLIAM J SLAVIN. \Vitnesses ORLIE JAYNE, C. J. LANGDON.

machine, the com.- 55

central shaft and pro- 75

